点击运行
<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>React 实例</title> <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script> <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script> <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script> </head> <body> <div id="example"></div> <script type="text/babel"> function UserGreeting(props) { return <h1>欢迎回来!</h1>; } function GuestGreeting(props) { return <h1>请先注册。</h1>; } function Greeting(props) { const isLoggedIn = props.isLoggedIn; if (isLoggedIn) { return <UserGreeting />; } return <GuestGreeting />; } ReactDOM.render( // Try changing to isLoggedIn={true}: <Greeting isLoggedIn={false} />, document.getElementById('example') ); </script> </body> </html>
运行结果
